index.js

module.exports = (bitfield) => {
	bitfield = BigInt(bitfield);
	let perms = {
		CREATE_INSTANT_INVITE: 0x0000000000000001,
		KICK_MEMBERS: 0x0000000000000002,
		BAN_MEMBERS: 0x0000000000000004,
		ADMINISTRATOR: 0x0000000000000008,
		MANAGE_CHANNELS: 0x0000000000000010,
		MANAGE_GUILD: 0x0000000000000020,
		ADD_REACTIONS: 0x0000000000000040,
		VIEW_AUDIT_LOG: 0x0000000000000080,
		PRIORITY_SPEAKER: 0x0000000000000100,
		STREAM: 0x0000000000000200,
		VIEW_CHANNEL: 0x0000000000000400,
		SEND_MESSAGES: 0x0000000000000800,
		SEND_TTS_MESSAGES: 0x0000000000001000,
		MANAGE_MESSAGES: 0x0000000000002000,
		EMBED_LINKS: 0x0000000000004000,
		ATTACH_FILES: 0x0000000000008000,
		READ_MESSAGE_HISTORY: 0x0000000000010000,
		MENTION_EVERYONE: 0x0000000000020000,
		USE_EXTERNAL_EMOJIS: 0x0000000000040000,
		VIEW_GUILD_INSIGHTS: 0x0000000000080000,
		CONNECT: 0x0000000000100000,
		SPEAK: 0x0000000000200000,
		MUTE_MEMBERS: 0x0000000000400000,
		DEAFEN_MEMBERS: 0x0000000000800000,
		MOVE_MEMBERS: 0x0000000001000000,
		USE_VAD: 0x0000000002000000,
		CHANGE_NICKNAME: 0x0000000004000000,
		MANAGE_NICKNAMES: 0x0000000008000000,
		MANAGE_ROLES: 0x0000000010000000,
		MANAGE_WEBHOOKS: 0x0000000020000000,
		MANAGE_GUILD_EXPRESSIONS: 0x0000000040000000,
		USE_APPLICATION_COMMANDS: 0x0000000080000000,
		REQUEST_TO_SPEAK: 0x0000000100000000,
		MANAGE_EVENTS: 0x0000000200000000,
		MANAGE_THREADS: 0x0000000400000000,
		CREATE_PUBLIC_THREADS: 0x0000000800000000,
		CREATE_PRIVATE_THREADS: 0x0000001000000000,
		USE_EXTERNAL_STICKERS: 0x0000002000000000,
		SEND_MESSAGES_IN_THREADS: 0x0000004000000000,
		USE_EMBEDDED_ACTIVITIES: 0x0000008000000000,
		MODERATE_MEMBERS: 0x0000010000000000,
		VIEW_CREATOR_MONETIZATION_ANALYTICS: 0x0000020000000000,
		USE_SOUNDBOARD: 0x0000040000000000,
		CREATE_GUILD_EXPRESSIONS: 0x0000080000000000,
		CREATE_EVENTS: 0x0000100000000000,
		USE_EXTERNAL_SOUNDS: 0x0000200000000000,
		SEND_VOICE_MESSAGES: 0x0000400000000000,
		SEND_POLLS: 0x0002000000000000,
		USE_EXTERNAL_APPS: 0x0004000000000000
	};
	return Object.entries(perms)
		.filter(([_perm_name, perm_bitfield]) => {
			return (bitfield & perm_bitfield) == perm_bitfield;
		})
		.map(([perm]) => perm);
};